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Originally Posted by dmorrison
Voltage now 12.8 engine off. 12.8 engine at idle. but at 1000RPM 13.4 volts and 13.5 at higher RPM's. Soit seems that the wires goin from the alternator to the startet terminal were old and building resistance. OR the battery ground was a problem.
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Hey Dave,
I'm just perusing because I can't sleep due to a bad stomach tonight.
But, in thinking about the "bad" cable from the alternator to the starter terminal, I do not see how it could provide enough resistance to drop the voltage as much as you have noted. The reason for this is the fact that the cable is designed for something like 65 amps. With a new battery and very little load on, the alternator output is probably less than 5 amps. So, could this cable be damaged to the point where it would show resistance at an output of 5 amps? Seems to be impossible. If it were true, it would probably melt if you sent 65 amps through it with everything running.
It seems to be far more likely that the ground connection from the battery must have had resistance at its end in some way. Cleaning this would have cleared this issue and the voltage would have returned to normal.